When wife's iphone was on iOS 5 it has perfect wifi reception in the room, along with ipad 2 (also iOS 5) and the galaxy s2 had crap wifi reception. router is telecom supplied thomson 585

But i've just realised now on iOS 6 the iphone cannot see wifi in the room at all. move about 10 metres closer it can get weak reception.

Why is there a problem - because the ipad 2 still on iOS 5 has perfect wifi reception, even the android has ok wifi!

What's changed apart from iOS 6 on the iPhone 4 - well i suspended my router vertical but that was before iOS 6 and i am very very sure it had good wifi then, even ok wifi during the first few weeks of iOS 6 where it would take a while to find it

but now ZERO wifi in the room no matter what channel i try

i have updated to iOS 6.0.1 but no change

any ideas?

edit: title edited to show that I bought the phone from Vodafone Oct 2010 ...

It's more likely you've got a hardware fault than an issue with the software - have you had the screen replaced? If so it's most likely that the person repairing has stuffed it up - this is the number 1 reason for poor wifi performance on the iPhone 4 we see it almost every day from DIY gone wrong